Wednesday, June 26, 2013

FINDING METACENTRIC HEIGHT: INCLINATION EXPERIMENT!


INCLINING EXPERIMENT

It is performed on Completed ships, to find out the ship's 
Conduct of the Experiment

Use of two pendulum, 1 fwd and 1 aft.
  • lenth of the pendulum must be as long as possible.
  • Bob must be immersed in oil (to dump vibrations).
  • 4 masses A,B,C,D must be put on-board.
  • The draughts and density are measured at the accurate level.
  • Ships mooring ropes are slackened.
  • 3 steps: 
  1. ABCD on port side; take deflection of pendulum
  2. ABCD on stbs side; take defection
  3. AB on port CD on dtbd; take deflection
  • All deflections are recorded,
Precautions to take,

  1. All tanks must be empty
  2. Minimum manning on-board
  3. Calm weather
  4. Mooring ropes slackened
  5. All tanks either pressed up full or empty
Stabilograph: Modern method of Inclining Experiment


This device consists of a metal pendulum balanced on knife edges as shown in the pic above.

Advantages,
A permanent record is obtained for all movements of the ship.
Accuracy in measurement comes as a free surprise.

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